(1S,2S,4aS,8aR)-5,5,8a-Trimethyl-1-(2-naphthalen-2-yl-ethyl)-decahydro-naphthalene-2-carboxylic acid 在
甲烷磺酸 、 phosphorus pentoxide 作用下,
以
二氯甲烷 为溶剂,
反应 1.5h,
生成 (4aS,6aS,15aS,15bR)-4,4,15b-Trimethyl-1,2,3,4,4a,5,6,6a,14,15,15a,15b-dodecahydro-cyclohepta[1,2-a;4,5-b']dinaphthalen-7-one 、 (1S,15S,16R,21S)-16,20,20-trimethylpentacyclo[13.8.0.03,12.04,9.016,21]tricosa-3(12),4,6,8,10-pentaen-2-one